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12(x-3000)=x-4200
We move all terms to the left:
12(x-3000)-(x-4200)=0
We multiply parentheses
12x-(x-4200)-36000=0
We get rid of parentheses
12x-x+4200-36000=0
We add all the numbers together, and all the variables
11x-31800=0
We move all terms containing x to the left, all other terms to the right
11x=31800
x=31800/11
x=2890+10/11
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